Proper identification of species is important because of the differences in life cycles and degree of crop damage. When you lift the turf, inspect the top 1 to 2 inches of soil for the white, C-shaped larvae. Most white grubs have a one year life cycle in Georgia. This is typically in summer and fall. Spring Stage-In spring the grub is hungry and goes to the root zone of your lawn to feed on its roots. Most lawn grubs have a one-year life cycle. Applications made as early as April usually have sufficient soil residual to control young grubs hatching from eggs in July or early August. Grubs begin to feed again, this time more aggressively. This is typically in summer and fall. Adult beetles mate and lay eggs throughout the spring season. Among others, turfgrass is perhaps the most common host for white grubs, along with Napier grass. As grub feeding continues, areas of turf (sod) begin to wilt and turn brown. The adult beetles emerge a few weeks later, in June and July, to complete the one-year cycle. Adult beetles lay eggs in the soil; the eggs grow into larvae (grubs). Unlike other white grubs found in the state, true white grubs have a three-year life cycle. They feed on the roots of their host plant, which is where the damage starts. During cold weather, they move 2-8 inches deep into the soil to overwinter. In Jun or early July, the Japanese beetles fly around to mate each other. The life cycle of the white grub consists of 4 stages, Egg, Larvae, Pupa, and Adult. This takes place beginning in early summer lasting for about a month. Sampling of potential infestation sites and early recognition of a grub problem can prevent turf loss and costly renovation. Insecticides used for curative control have relatively short residual effectiveness (usually 2 to 3 weeks or less). The Adult beetle is the final stage in the life cycle of the white grub. Multiple products are available and give excellent control of newly hatched white grubs when applied weeks or months before the grubs have hatched. Most turfgrass-feeding white grubs in Texas, such as the June beetle and southern masked chafer, require 1 year to complete their life cycle (a 2-year cycle is suspected in a portion of the grub populations in north Texas). One of the better ways to check for White Curl Grubs is to apply a layer on top of the lawn after the lawn has been watered for the day. How to treat lawn grubs. The best time to apply curative grub insecticides is in early to mid August when grubs are still small and their feeding damage is relatively light. Adults emerge from late spring to early summer and fly to nearby trees. During this 4 stage process, the white grub transforms itself in shape, size, colour and feeding habits. The pupae life stage takes place after the larvae feeding has finished. The turf may also feel spongy as you walk over the infested area. While many homeowners consider grubs out of sight, out of mind, these larvae can cause damage to all turfgrass species. Turf damage can start to become visible if infestation levels are high. This feeding lasts for a short time as the larvae stop feeding and turn into pupae. However, these predatory varmints may be interested in earthworms or other soil insects in addition to grubs. Eggs are laid in the soil 1 to 8 inches below the surface, in clusters of between 15 and 20. Due to their familiar appearance, many people often mistake these white grubs for Witchety Grubs, but they are not. The true white grubs life cycle lasts for 3-4 years (termed semivoltine) in the Northern Plains while the annual white grubs produce one generation per year (termed univoltine). Adult beetles lay eggs in the soil; the eggs grow into larvae (grubs). White Grub Control - The White Grub Lifecycle. 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